Gilbert de Clare, 5th Earl of Gloucester

Gilbert de Clare, 5th Earl of Gloucester (1180-25 October 1230) was Earl of Hertford from 1217 (and Earl of Gloucester from 1225) to 1230, succeeding Richard de Clare and preceding Richard de Clare.

Biography
Gilbert de Clare was born in Hertforrd, Hertfordshire, England in 1180, the son of Richard de Clare, 3rd Earl of Hertford. In 1215, Gilbert and his father were both made Magna Carta sureties and championed Dauphin Louis of France during the First Barons' War. In 1217, he was taken prisoner by William Marshal, and he went on to marry his daughter Isabel Marshal. In 1225, he was present at Henry III of England's confirmation of the Magna Carta, and he took part in a 1228 campaign in Wales. He then joined an expedition to Brittany, and he died there in 1230.